Also, engage with, befriend, seek alliance with, and build good relations with.
The act of seeking out a person or group with whom one wishes to make common cause, then hectoring them at very great length over their personal and collective failings, religious and political beliefs, habits, friends and acquaintances etc.
To browbeat, to lecture. Also, to chide, sermonise, rebuke, tell off, dress down, hassle, harangue, preach to, scold, admonish, and shout at. The more belligerently one engages with a potential ally, the more likely that person is to grasp the firmness of ones opinions and the urgency of the situation.
"There's no doubt that the radicalisation of young Muslim men in Britain is a major problem. I say that we should reach out to moderate Muslims."
"Right! I've been making common cause with them for years -now's my chance to really befriend some sense into them on a one-to-one basis. I'll engage with those fuckers like they've never been engaged with before."